SHIFT MODE CONTROL SYSTEM

A shift mode control system includes a control apparatus that controls a shift mode of a vehicle, a first operation device that receives a first operation to switch an automatic mode to a manual mode, and a second operation device that receives a second operation to switch the manual mode to the automatic mode. The control apparatus includes a processor that calculates a speed ratio change amount that is a difference between a first speed ratio set when the automatic mode is switched to the manual mode in accordance with the first operation and a second speed ratio set when the manual mode is switched to the automatic mode in accordance with the second operation. The processor updates the speed ratio change amount set as a switching condition for automatically switching the manual mode to the automatic mode to the speed ratio change amount calculated by the processor.